So your website is all set up to generate you tons of leads… Rad! Unfortunately, your contact form submissions are getting stuck in your spam folder (not rad).
I use Gravity Forms on all my sites, but this issue can arise from any form plugin because WordPress uses PHP to send mail.
The best solution is probably to send email over SMTP. But that is a bit of a chore, and will probably require you to sign up for a SendGrid (or similar) subscription service. Not a biggy, but when you build lots of sites like I do, it’s sort of a bummer.
Here’s an alternative:
That oughtta’ do it. Good luck!